Coupler Lock Trailer Boat RV Hitch Theft Protection Trailer coupler lock Guards against trailer theft while your trailer is unhitched from vehicle Heavy-duty cast steel construction; Advanced locking mechanism resists picking and prying Fits 1-7/8", 2", and 2-5/16" Couplers ; Weight: 2.25lb Roughly Quantity: 1 ; 2 Keys INCLUDED ; Weather-resistant zinc finish resists rust